Filter media including flame retardant fibers

US11738295B2 · kind B2 · utility

Assignee

• Hollingsworth & Vose Company · US

Inventors

• Xiaodan Zhang · Beijing, CN
• Douglas M. Guimond · Pepperell, US
• Carrie Liu · Hudson, US
• Nagendra Anantharamaiah · Acton, US
• Sudhakar Jaganathan · Northborough, US
• Gerald Gadbois · Rochester, US
• Maxim Silin · Hudson, US
• Mark A. Gallimore · Christiansburg, US

Key dates

• Filing date: Apr 21, 2021
• Grant date: Aug 29, 2023
• Expiry date: Oct 5, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2239/1291
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Filter media including a filtration layer comprising fibers (e.g., synthetic fibers) comprising a flame retardant and related components, systems, and methods associated herewith are provided. In some embodiments, a filtration layer may include a nonwoven web (e.g., wet-laid nonwoven web) comprising fibers including a certain flame retardant that has a relatively low concentration of or is substantially free of certain undesirable and/or toxic components (e.g., halogens). In certain embodiments, the nonwoven web may also comprise a blend of fibers. For instance, in some embodiments, the nonwoven web may also comprise a blend of coarse and fine diameter synthetic fibers that impart beneficial performance properties to the filtration layer. In some embodiments, the filtration layer may be designed to have a desirable flame retardancy (e.g., F1 rating, K1 rating) and performance properties without compromising certain mechanical properties (e.g., pleatability of the media) and/or environmental attributes (e.g., relatively low toxicity). Filter media described herein may be particularly well-suited for applications that involve filtering air, though the media may also be used in other …